JPH09236514A - Apparatus for diagnosing driving state of engine - Google Patents
Apparatus for diagnosing driving state of engineInfo
- Publication number
- JPH09236514A JPH09236514A JP6752796A JP6752796A JPH09236514A JP H09236514 A JPH09236514 A JP H09236514A JP 6752796 A JP6752796 A JP 6752796A JP 6752796 A JP6752796 A JP 6752796A JP H09236514 A JPH09236514 A JP H09236514A
- Authority
- JP
- Japan
- Prior art keywords
- cylinder
- engine
- cylinder pressure
- frequency response
- response function
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/02—Circuit arrangements for generating control signals
- F02D41/14—Introducing closed-loop corrections
- F02D41/1497—With detection of the mechanical response of the engine
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D35/00—Controlling engines, dependent on conditions exterior or interior to engines, not otherwise provided for
- F02D35/02—Controlling engines, dependent on conditions exterior or interior to engines, not otherwise provided for on interior conditions
- F02D35/023—Controlling engines, dependent on conditions exterior or interior to engines, not otherwise provided for on interior conditions by determining the cylinder pressure
- F02D35/024—Controlling engines, dependent on conditions exterior or interior to engines, not otherwise provided for on interior conditions by determining the cylinder pressure using an estimation
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/22—Safety or indicating devices for abnormal conditions
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B3/00—Engines characterised by air compression and subsequent fuel addition
- F02B3/06—Engines characterised by air compression and subsequent fuel addition with compression ignition
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/24—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means
- F02D41/26—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means using computer, e.g. microprocessor
- F02D41/28—Interface circuits
- F02D2041/286—Interface circuits comprising means for signal processing
- F02D2041/288—Interface circuits comprising means for signal processing for performing a transformation into the frequency domain, e.g. Fourier transformation
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/40—Engine management systems
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明はエンジンの運転が健
全な状態でなされているか否かを診断するエンジンの運
転状態診断装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an engine operating condition diagnosing device for diagnosing whether or not an engine is operating in a healthy condition.
【０００２】[0002]
【従来の技術】エンジン、特に定置型ディーゼルエンジ
ン、舶用ディーゼルエンジン等においては、長時間連続
して運転されるため、エンジンが異常状態に陥ることな
く運転されているか否か、つまりエンジンの運転状態の
健全性を監視あるいは検知することがなされている。2. Description of the Related Art Engines, particularly stationary diesel engines and marine diesel engines, are continuously operated for a long time. Therefore, whether or not the engine is operating without being in an abnormal state, that is, the operating state of the engine Is being monitored or detected.
【０００３】図２はシリンダ内の圧力を検出して、上記
のようなエンジンの運転状態の健全性を診断するシステ
ムの従来の１例を示す構成図である。図２において、１
００はエンジン、１０２は同エンジンのピストン、１０
３はシリンダブロック、１０１は同ピストン１０２の上
部とシリンダブロック１０３を構成するシリンダヘッド
とにより区画形成される燃焼室である。FIG. 2 is a block diagram showing an example of a conventional system for diagnosing the soundness of the engine operating condition as described above by detecting the pressure in the cylinder. In FIG. 2, 1
00 is an engine, 102 is a piston of the engine, 10
Reference numeral 3 is a cylinder block, and 101 is a combustion chamber defined by an upper portion of the piston 102 and a cylinder head forming the cylinder block 103.
【０００４】１１は前記燃焼室１０１内の圧力を検出す
る筒内圧力センサであり、前記シリンダヘッドに該セン
サ取付け用の穴加工を施し、この取付け穴にセンサを埋
め込み、燃焼室１０１内の圧力即ち筒内圧力波形を直接
検出する。Reference numeral 11 denotes an in-cylinder pressure sensor for detecting the pressure in the combustion chamber 101. The cylinder head is provided with a hole for mounting the sensor, and the sensor is embedded in the mounting hole to detect the pressure in the combustion chamber 101. That is, the in-cylinder pressure waveform is directly detected.
【０００５】上記筒内圧力センサ１１で検出された筒内
圧力Ｐは比較診断部１２に入力され、ここで筒内圧力デ
ータベース１３に記憶された健全状態における筒内圧力
Ｐ0と比較される。そして該比較診断部１２は、その診
断結果、つまり、上記筒内圧力の検出値Ｐが筒内圧力の
許容値Ｐ0の範囲内にあるか否かを判定した判定結果Ｓ
を診断結果出力部１４に送る。The in-cylinder pressure P detected by the in-cylinder pressure sensor 11 is input to the comparison / diagnosis unit 12 where it is compared with the in-cylinder pressure P 0 in a healthy state stored in the in-cylinder pressure database 13. Then, the comparison diagnosis unit 12 determines the diagnosis result, that is, the determination result S that determines whether the detected value P of the in-cylinder pressure is within the range of the allowable value P 0 of the in-cylinder pressure.
Is sent to the diagnostic result output unit 14.
【０００６】診断結果出力部１４は前記判定結果を記録
手段、表示手段等を介して、外部から検知可能なデータ
として出力する。The diagnostic result output unit 14 outputs the determination result as data that can be detected from the outside through a recording unit, a display unit, and the like.
【０００７】[0007]
【発明が解決しようとする課題】しかしながら、前記従
来の筒内圧力検知による運転状態診断装置は、筒内圧力
センサ１１のシリンダヘッドへの取付けのための加工に
多くの工数と費用を要するとともに、給排気弁や燃料噴
射弁が装着されているシリンダヘッドに筒内圧力センサ
１１の取付けスペースを確保するのは構造上困難であ
り、辛うじてこれが確保できたとしても該センサ１１の
設置によってエンジン性能の低下を来たす恐れがある等
の問題点がある。However, in the above-described conventional operating state diagnostic device based on the in-cylinder pressure detection, a lot of man-hours and cost are required for the process for attaching the in-cylinder pressure sensor 11 to the cylinder head, and It is structurally difficult to secure a mounting space for the in-cylinder pressure sensor 11 in the cylinder head in which the air supply / exhaust valve and the fuel injection valve are mounted. There are problems such as the possibility of a decline.
【０００８】またエンジン運転状態の異常の有無を検知
する基礎データとしてエンジン側面の振動を検出する手
段も提案されてはいるが、この場合は異常が検出されて
も、異常の原因の検知及び異常な部位の特定が困難であ
る。Although a means for detecting vibrations on the side surface of the engine has been proposed as basic data for detecting whether or not there is an abnormality in the engine operating state, in this case, even if an abnormality is detected, the cause of the abnormality is detected and the abnormality is detected. It is difficult to identify the proper part.
【０００９】本発明の目的は、簡単な構造かつ少ない工
数でエンジン運転状態の検知ができ、また運転状態の異
常発生部位の特定が容易にできるエンジンの運転状態診
断装置を提供するにある。SUMMARY OF THE INVENTION An object of the present invention is to provide an engine operating condition diagnosing device which can detect an engine operating condition with a simple structure and a small number of man-hours and can easily identify a portion where an abnormal operating condition occurs.
【００１０】[0010]
【課題を解決するための手段】本発明に係るエンジンの
運転状態診断装置は；シリンダヘッド、シリンダジャケ
ットを含むシリンダブロックの振動加速度を検出する加
速度検出器と；予め測定した筒内圧力と前記シリンダブ
ロックの振動応答との間の周波数応答関数と、前記検出
された振動加速度とにより筒内圧力を算出する手段と；
この算出された筒内圧力と健全燃焼及び異常燃焼の筒内
圧力データとを比較し、エンジンの運転状態の異常の有
無を判定する比較診断部とを備えたことを特徴としてい
る。An engine operating condition diagnosis apparatus according to the present invention includes: an acceleration detector for detecting vibration acceleration of a cylinder block including a cylinder head and a cylinder jacket; a cylinder pressure measured in advance and the cylinder. Means for calculating the in-cylinder pressure based on the frequency response function between the vibration response of the block and the detected vibration acceleration;
It is characterized by including a comparison diagnosis unit that compares the calculated in-cylinder pressure with in-cylinder pressure data of healthy combustion and abnormal combustion and determines whether or not there is an abnormality in the operating state of the engine.
【００１１】本発明は上記のように、シリンダブロック
の振動加速度を加速度検出器にて検出するとともに、予
め筒内圧力とシリンダブロックの振動応答との間の周波
数応答関数を測定しておき、この周波数応答関数と前記
検出振動加速度スペクトルとより運転状態異常の有無判
定データとなる筒内圧力を算出するので、加速度センサ
を用いることにより、従来のもののような筒内圧力セン
サは不要となり、センサの取付けが簡単化されるととも
に、シリンダヘッド上に大きな設置スペースを要しな
い。As described above, according to the present invention, the vibration acceleration of the cylinder block is detected by the acceleration detector, and the frequency response function between the in-cylinder pressure and the vibration response of the cylinder block is measured in advance. Since the in-cylinder pressure that is the operating condition abnormality presence / absence determination data is calculated from the frequency response function and the detected vibration acceleration spectrum, the use of the acceleration sensor eliminates the need for the in-cylinder pressure sensor unlike the conventional one. The installation is simple and does not require a large installation space on the cylinder head.
【００１２】また運転状態の診断の基準が振動の起振力
であるので異常が検知された際の異常発生部位の特定が
容易にでき、対策を容易かつ確実に行える。Further, since the vibration diagnostic force is used as the criterion for diagnosing the operating state, it is possible to easily identify the abnormal portion when an abnormality is detected, and it is possible to easily and surely take countermeasures.
【００１３】[0013]
【発明の実施の形態】以下図１を参照して本発明の実施
形態を詳細に説明する。図１は本発明の実施形態に係る
ディーゼルエンジンの運転状態診断装置を示すブロック
図である。DETAILED DESCRIPTION OF THE INVENTION An embodiment of the present invention will be described in detail below with reference to FIG. FIG. 1 is a block diagram showing an operating condition diagnosis device for a diesel engine according to an embodiment of the present invention.
【００１４】図１において、１００はエンジン、１０２
は同エンジンのピストン、１０３はシリンダヘッド、シ
リンダジャケット等からなるシリンダブロック、１０１
は燃焼室である。１は上記シリンダブロック１０３に取
付けられた加速度検出器であり、エンジン運転時の振動
加速度応答Ｘ（ｔ）を検出する。In FIG. 1, 100 is an engine and 102 is an engine.
Is a piston of the engine, 103 is a cylinder block including a cylinder head, a cylinder jacket, etc., 101
Is a combustion chamber. An acceleration detector 1 is attached to the cylinder block 103 and detects a vibration acceleration response X (t) during engine operation.
【００１５】上記加速度検出器１で検出されたシリンダ
ブロック１０３の加速度応答Ｘ（ｔ）はフーリエ変換器
２に入力され、ここで周波数領域にフーリエ変換されそ
のスペクトルＸ（ω）が除算器３に出力される。The acceleration response X (t) of the cylinder block 103 detected by the acceleration detector 1 is input to the Fourier transformer 2, where it is Fourier transformed into the frequency domain and its spectrum X (ω) is fed to the divider 3. Is output.
【００１６】４は周波数応答関数設定器であり、筒内圧
力とシリンダブロックの振動応答との間の周波数応答関
数を予め測定した周波数応答関数データＨ（ω）が設定
されている。３は除算器であり、上記フーリエ変換器２
から出力されたスペクトルＸ（ω）と上記周波数応答関
数Ｈ（ω）との除算即ち（Ｘ（ω）／Ｈ（ω））を行
い、筒内圧力スペクトル推定値Ｐ（ω）＝Ｘ（ω）／Ｈ
（ω）を得る。Reference numeral 4 is a frequency response function setting device, in which frequency response function data H (ω) obtained by previously measuring a frequency response function between the in-cylinder pressure and the vibration response of the cylinder block is set. 3 is a divider, which is the Fourier transformer 2
The spectrum X (ω) output from the above is divided by the frequency response function H (ω), that is, (X (ω) / H (ω)), and the cylinder pressure spectrum estimated value P (ω) = X (ω ) / H
(Ω).
【００１７】１３は筒内圧力データベースであり、燃焼
室１０１内での燃焼が燃焼不良や筒内圧力の異常な上昇
のない完全燃焼即ち健全燃焼時の筒内圧力及び異常燃焼
時の筒内圧力のデータベースが設定されている。Reference numeral 13 denotes an in-cylinder pressure database, which is a complete combustion without combustion failure or an abnormal increase in in-cylinder pressure in the combustion chamber 101, that is, in-cylinder pressure during normal combustion and in-cylinder pressure during abnormal combustion. Database is set.
【００１８】５は比較診断部であり、該比較診断部５
は、前記除算器３から筒内圧力スペクトルの推定値Ｐ
（ω）が入力され、この筒内圧力推定値Ｐ（ω）と、前
記筒内圧力データベースから読み出された健全燃焼時及
び異常燃焼時の筒内圧力スペクトルＰ0（ω）とを比較
し、筒内圧力推定値Ｐ（ω）が健全燃焼状態のものであ
るか、異常燃焼状態のものであるかを判定する。即ち該
比較診断部５においては時々刻々の筒内圧力の健全性を
判定し、その結果Ｓ1を診断結果出力部７に伝送する。Reference numeral 5 is a comparative diagnosis unit, and the comparative diagnosis unit 5
Is the estimated value P of the in-cylinder pressure spectrum from the divider 3.
(Ω) is input, and the estimated in-cylinder pressure value P (ω) is compared with the in-cylinder pressure spectrum P 0 (ω) during normal combustion and abnormal combustion read from the in-cylinder pressure database. It is determined whether the in-cylinder pressure estimated value P (ω) is in the normal combustion state or in the abnormal combustion state. That is, the comparative diagnosis unit 5 judges the soundness of the in-cylinder pressure every moment and transmits the result S 1 to the diagnosis result output unit 7.
【００１９】診断結果出力部７では、前記判定結果Ｓ1
を記録手段、表示手段等を介して外部から検知可能なデ
ータとして出力する。In the diagnosis result output unit 7, the judgment result S 1
Is output as data that can be detected from the outside via a recording unit, a display unit, or the like.
【００２０】以上のように、本発明に係る上記実施形態
においては、シリンダブロックに、その加速度を検出す
る加速度検出器を取付けるのみであるので、従来の筒内
圧力センサを用いる方式よりもセンサの設置が簡単に行
える。また診断の基準が起振力であるので、エンジンの
異常発生時における発生部位の特定が容易にでき、従っ
て対策が容易かつ確実に行える。As described above, in the above-described embodiment of the present invention, only the acceleration detector for detecting the acceleration is attached to the cylinder block. Easy to set up. Further, since the diagnostic criterion is the excitation force, it is possible to easily identify the occurrence site when the engine abnormality occurs, and therefore it is possible to easily and surely take countermeasures.
【００２１】[0021]
【発明の効果】本発明は、以上のように簡便に計測でき
るシリンダブロックの加速度データを周波数応答関数を
介して筒内圧力に変換することにより、エンジンの燃焼
状態即ち運転状態の健全性を診断するので、従来のもの
のような筒内圧力センサが不要となってシリンダヘッド
上に大きなセンサ取付けスペースが不要となり、センサ
の取付けが簡単化され、取付け工数の低減、低コスト化
を実現できる。As described above, the present invention diagnoses the soundness of the combustion state of the engine, that is, the operating state by converting the acceleration data of the cylinder block, which can be easily measured as described above, into the cylinder pressure through the frequency response function. Therefore, a cylinder pressure sensor as in the conventional one is not required, a large sensor mounting space is not required on the cylinder head, sensor mounting is simplified, and the number of mounting steps can be reduced and the cost can be reduced.
【００２２】また、運転状態の診断の基準が振動の起振
力であるので、異常が検知された際の異常発生部位の特
定が容易にでき、対策を容易にかつ確実に行うことがで
きる。Further, since the vibration diagnostic force is used as the criterion for diagnosing the operating state, it is possible to easily identify the abnormal portion when an abnormality is detected, and it is possible to easily and reliably take measures.
【図１】本発明の実施形態に係るディーゼル機関の運転
状態診断装置のブロック図である。FIG. 1 is a block diagram of an operating state diagnosis device for a diesel engine according to an embodiment of the present invention.
【図２】従来例を示す図１応当図である。FIG. 2 is a diagram corresponding to FIG. 1 showing a conventional example.
１…加速度検出器、２…フーリエ変換器、３…除算器、
４…周波数応答関数設定器、５…比較診断部、７…診断
結果出力部、１３…筒内圧力データベース、１００…エ
ンジン、１０１…燃焼室、１０３…シリンダブロック。1 ... Acceleration detector, 2 ... Fourier transformer, 3 ... Divider,
4 ... Frequency response function setting device, 5 ... Comparative diagnosis part, 7 ... Diagnosis result output part, 13 ... In-cylinder pressure database, 100 ... Engine, 101 ... Combustion chamber, 103 ... Cylinder block.
Claims (1)
含むシリンダブロックの振動加速度を検出する加速度検
出器（１）と；予め測定した筒内圧力と前記シリンダブ
ロックの振動応答との間の周波数応答関数と、前記検出
された振動加速度とにより筒内圧力を算出する手段と；
この算出された筒内圧力と健全燃焼及び異常燃焼の筒内
圧力データとを比較し、エンジンの運転状態の異常の有
無を判定する比較診断部（５）とを備えたことを特徴と
するエンジンの運転状態診断装置。1. An acceleration detector (1) for detecting a vibration acceleration of a cylinder block including a cylinder head and a cylinder jacket; a frequency response function between a cylinder pressure measured in advance and a vibration response of the cylinder block. Means for calculating a cylinder pressure based on the detected vibration acceleration;
An engine provided with a comparison diagnosis unit (5) for comparing the calculated in-cylinder pressure with in-cylinder pressure data of healthy combustion and abnormal combustion to determine whether or not there is an abnormality in the operating state of the engine. Operating condition diagnostic device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6752796A JPH09236514A (en) | 1996-02-29 | 1996-02-29 | Apparatus for diagnosing driving state of engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6752796A JPH09236514A (en) | 1996-02-29 | 1996-02-29 | Apparatus for diagnosing driving state of engine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH09236514A true JPH09236514A (en) | 1997-09-09 |
Family
ID=13347548
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6752796A Withdrawn JPH09236514A (en) | 1996-02-29 | 1996-02-29 | Apparatus for diagnosing driving state of engine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH09236514A (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0940568A1 (en) * | 1998-02-20 | 1999-09-08 | MAGNETI MARELLI S.p.A. | Method for determining the progress of internal pressure of a cylinder in an internal combustion engine |
| EP0985919A1 (en) * | 1998-09-10 | 2000-03-15 | MAGNETI MARELLI S.p.A. | Method for determining the progression of the load torque in an internal-combustion engine |
| GB2442751A (en) * | 2006-10-13 | 2008-04-16 | Denso Corp | Engine Parameter Signal Estimation |
| JP2008106782A (en) * | 2008-01-15 | 2008-05-08 | Hitachi Ltd | Device and method for controlling multi-cylinder engine |
| JP2016011596A (en) * | 2014-06-27 | 2016-01-21 | 日立オートモティブシステムズ株式会社 | Internal combustion engine combustion pressure detection method and internal combustion engine combustion pressure detector |
| CN110770427A (en) * | 2017-06-02 | 2020-02-07 | 世倍特集团有限责任公司 | Method for detecting a current correction value of an inlet section of a combustion motor during operation |
| CN115288849A (en) * | 2022-08-15 | 2022-11-04 | 武汉优泰电子技术有限公司 | Reciprocating engine combustion chamber wear state evaluation method and device |
-
1996
- 1996-02-29 JP JP6752796A patent/JPH09236514A/en not_active Withdrawn
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0940568A1 (en) * | 1998-02-20 | 1999-09-08 | MAGNETI MARELLI S.p.A. | Method for determining the progress of internal pressure of a cylinder in an internal combustion engine |
| EP0985919A1 (en) * | 1998-09-10 | 2000-03-15 | MAGNETI MARELLI S.p.A. | Method for determining the progression of the load torque in an internal-combustion engine |
| GB2442751A (en) * | 2006-10-13 | 2008-04-16 | Denso Corp | Engine Parameter Signal Estimation |
| JP2008106782A (en) * | 2008-01-15 | 2008-05-08 | Hitachi Ltd | Device and method for controlling multi-cylinder engine |
| JP4602420B2 (en) * | 2008-01-15 | 2010-12-22 | 株式会社日立製作所 | Control device and control method for multi-cylinder engine |
| JP2016011596A (en) * | 2014-06-27 | 2016-01-21 | 日立オートモティブシステムズ株式会社 | Internal combustion engine combustion pressure detection method and internal combustion engine combustion pressure detector |
| CN110770427A (en) * | 2017-06-02 | 2020-02-07 | 世倍特集团有限责任公司 | Method for detecting a current correction value of an inlet section of a combustion motor during operation |
| US11359563B2 (en) | 2017-06-02 | 2022-06-14 | Vitesco Technologies GmbH | Method for determining the current trimming of the intake tract of an internal combustion engine during operation |
| CN110770427B (en) * | 2017-06-02 | 2022-07-29 | 世倍特集团有限责任公司 | Method for determining a current trim value for the length of an intake pipe of an internal combustion engine |
| CN115288849A (en) * | 2022-08-15 | 2022-11-04 | 武汉优泰电子技术有限公司 | Reciprocating engine combustion chamber wear state evaluation method and device |
| CN115288849B (en) * | 2022-08-15 | 2023-02-28 | 武汉优泰电子技术有限公司 | Reciprocating engine combustion chamber wear state evaluation method and device |
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